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Diffstat (limited to 'kernel/arch/s390/hypfs/hypfs_dbfs.c')
-rw-r--r--kernel/arch/s390/hypfs/hypfs_dbfs.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/kernel/arch/s390/hypfs/hypfs_dbfs.c b/kernel/arch/s390/hypfs/hypfs_dbfs.c
new file mode 100644
index 000000000..752f6df3e
--- /dev/null
+++ b/kernel/arch/s390/hypfs/hypfs_dbfs.c
@@ -0,0 +1,104 @@
+/*
+ * Hypervisor filesystem for Linux on s390 - debugfs interface
+ *
+ * Copyright IBM Corp. 2010
+ * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
+ */
+
+#include <linux/slab.h>
+#include "hypfs.h"
+
+static struct dentry *dbfs_dir;
+
+static struct hypfs_dbfs_data *hypfs_dbfs_data_alloc(struct hypfs_dbfs_file *f)
+{
+ struct hypfs_dbfs_data *data;
+
+ data = kmalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return NULL;
+ data->dbfs_file = f;
+ return data;
+}
+
+static void hypfs_dbfs_data_free(struct hypfs_dbfs_data *data)
+{
+ data->dbfs_file->data_free(data->buf_free_ptr);
+ kfree(data);
+}
+
+static ssize_t dbfs_read(struct file *file, char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ struct hypfs_dbfs_data *data;
+ struct hypfs_dbfs_file *df;
+ ssize_t rc;
+
+ if (*ppos != 0)
+ return 0;
+
+ df = file_inode(file)->i_private;
+ mutex_lock(&df->lock);
+ data = hypfs_dbfs_data_alloc(df);
+ if (!data) {
+ mutex_unlock(&df->lock);
+ return -ENOMEM;
+ }
+ rc = df->data_create(&data->buf, &data->buf_free_ptr, &data->size);
+ if (rc) {
+ mutex_unlock(&df->lock);
+ kfree(data);
+ return rc;
+ }
+ mutex_unlock(&df->lock);
+
+ rc = simple_read_from_buffer(buf, size, ppos, data->buf, data->size);
+ hypfs_dbfs_data_free(data);
+ return rc;
+}
+
+static long dbfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct hypfs_dbfs_file *df = file_inode(file)->i_private;
+ long rc;
+
+ mutex_lock(&df->lock);
+ if (df->unlocked_ioctl)
+ rc = df->unlocked_ioctl(file, cmd, arg);
+ else
+ rc = -ENOTTY;
+ mutex_unlock(&df->lock);
+ return rc;
+}
+
+static const struct file_operations dbfs_ops = {
+ .read = dbfs_read,
+ .llseek = no_llseek,
+ .unlocked_ioctl = dbfs_ioctl,
+};
+
+int hypfs_dbfs_create_file(struct hypfs_dbfs_file *df)
+{
+ df->dentry = debugfs_create_file(df->name, 0400, dbfs_dir, df,
+ &dbfs_ops);
+ if (IS_ERR(df->dentry))
+ return PTR_ERR(df->dentry);
+ mutex_init(&df->lock);
+ return 0;
+}
+
+void hypfs_dbfs_remove_file(struct hypfs_dbfs_file *df)
+{
+ debugfs_remove(df->dentry);
+}
+
+int hypfs_dbfs_init(void)
+{
+ dbfs_dir = debugfs_create_dir("s390_hypfs", NULL);
+ return PTR_ERR_OR_ZERO(dbfs_dir);
+}
+
+void hypfs_dbfs_exit(void)
+{
+ debugfs_remove(dbfs_dir);
+}